Gramophone speed-indicator.



PATENTBD JAN. 1, 1907.

0. .A. CORNWALL. GRAMOPHONE SPEED INDICATOR.

APPLICATION PIL ED AUG. 9. 1906.

INVENTOR 679121 e12? jib/1210a.

17W &

THE NORRIS PEYERS cm, WASHINGTON, B4 c, I

TTNITED PATENT OFFICE.

CLEMENT A. CORNWALL, or Asncaorr, BRITISH ooLUMBIA, CANADA.

GRAMOPHONE SPEED-INDICATOR.

.Bpecification of Letters Patent.

Patented Jan. 1, 1907.

Application filed August 9,1906. Serial No. 32Si.857.

- To all whom it may concern:

Be it known that I, CLEMENT A. CORN I WALL, a citizen of Canada, residing at Ashcroft, in the Province of British Columbia, Canada, have inventedva new and; useful Gramophone Speed-Indicator, of which the following is 'a specification.

This invention relates to an improved means for indicating the movement of the brake-screw by which the speed of the mechanism which rotates a gramophone-record is controlled.

, The mechanism by which a gramophonerecord is rotated is generally controlled by a small brake acting on the periphery of a rotatable part of the mechanism, which brake is operated 'by a screw threaded through the casing and bearing on the end of the lever to which the brake is attached. The move ment of the screw to effect a-yariation of the speed of rotation is soslight that diiliculty is experienced in setting the brake to give any desired speed. This difliculty I have overcome by providing a light pointer which will multiply the movement of the brake-screw or its lever and will indicate the amount of such movement on a graduated scale, so that if a certain position of the pointer is found to phonewith my invention applied. Fig. 2 is a vertical longitudinal section thereof, show ing my invention and the parts immediately connected therewith, the remaining portion of the gramophone mechanism being omitted for clearness of illustration. Fig. 3 is a crosssection thereof.

In the drawings, 2 represents the casing or box which incloses the mechanism, 3 being the base. 4 is the lever by which thebrake is applied, and5 the screw by which such lever is operated.

Adjacent to the end of the brake-lever 4 to which the screw 5 is applied is pivotally mounted on a fulcrum-pin 6 a light lever 10, the short endll of which is in engagement with the under side of the lever 4 and the longer end is produced though a vertical slot 13 in the casing 2 to form an indicating.- pointer 12. The fulcrumin 6 is secured in ameinber 7, vertically a justable in an attachment 8, securedto the base 3 of the easing by a screw 9 in an elongated aperture 16. The edge of the slot 13 of the casing is provided with a graduated scale 14, and the slot may be covered with a glass 15 to exclude dust.

Any movement oithe end ofthelever 4 to vary the speed of therecord-rotating mechanism will thus be multiplied and indicated by the pointer 12 on the scale 14, and the reading on the scale forthe various records may be noted on them to ailord ameans for future setting of the brake without the necessity of preliminary'trial.

The vertical movement of the fulcrum-pin 6 affords a means for setting the pointer 12 to the graduations of the scale.

The device is simple and readily applied and requires no alteration of existing mechanis'm.

Having now particularly described my invention and the manner of its application and use, I hereby declare that what I claim as new, and desire to be protected by Letters Patent, is

' 1. The combination with the pivotallymounted bralre-lever of a gramophone and an adjusting-screw therefor, of a pivotallymounted pointer, a support to which said pointer is pivotally mounted, said support comprising a fixed base member having a slideway, a supplemental member connected to said fixed 'base member and held in said slideway, said supplemental member having a slot portion, a set-screw passing through said slot portion into the fixed member, and a graduated scale cooperating with the free end of said pointer, substantially as shown and described.

2. In a device of the class described, the combination with the brake-lever, of a pivotally-inounted pointer cooperating therewith,

a support to which said pointer is pivotally mounted, said support comprising a fixed adjustment and a member vertically adjustable insaid' fixed adjustment, said pointer being pivotally mounted to said vertically-adjust- In testimony whereof I have signed my able member, a casing for the whole, said name to this Specification in the presence of casing having a slot through which the end of two subscribing witnesses.

the pointer projects, a graduated scale se- CLEMENT A. CORNWALL. cured t0 the casing adjacent the slot, and a Witnessesz: r

glass covering for the slot and the scale sub- CLEMENT FRANCIS CORNWALL,

stantially as shown. FITZALAN V. CORNWALL. 

